On Thu 31-03-16 17:38:06, Xishi Qiu wrote: [...] > Hi Michal, > > It's arm64, so DMA is [0-4G], and Normal is [4G-] I wasn't aware of that. Thanks for the clarification. > Is that something wrong with the RAM hardware, then trigger the problem? This is hard to tell but I would try to check which of the page fault path has returned with VM_FAULT_OOM. This might be a wrong .fault callback. -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>